My honeywell thermostat electric, shows "filter" change light blinking and won't turn on the heater when turned up. The thermostat will 'click' when temp turned up and I can manually turn on the fan but no fire in the heater. The thermostat is 1 year old, filter changed

My furnace is making a scratchy noise, almost like there is a metallic wire scratching the inside of the furnace. It is not a rattling sound and this is not its normal noise. It seems to be making it even when the heating or the domestic hot water systems are not calling for hot water. In other...

We just bought this house. There are two heat sources, one for each floor. The unit in the attic is making a funny noise when it fires up. It sounds like coffee percolating or something whistling, along with the normal burn sound. I've never had forced air heat and, being in North Carolina, I don't...

I have an old Day and Night (over 16 y/o) gas forced air heater that is blowing cool air only. The Model # is 8OU-19A or 8QU-19A. The igniter/pilot appears to be working fine & when the temp controls are raised the fan comes on but the main burners do not. Where do I start, even if the pilot seems...

In the 1st floor slab bathroom, hissing air comes out of the sink drain whenever the central heat comes on. In addition, the air that comes out, of course smelly like sewage. Now, I know I can do the bleach procedure, but what I don't get is why the air is flowing. There is a p trap in place,...